#!/usr/bin/python3

# Fibonacci series: 斐波纳契数列
# 两个元素的总和确定了下一个数

var1 = 100
if var1:
    print("1-if is true")
    print(var1)

var2 = 0
if var2:
    print("2-if is true")
    print(var2)
print("Good bye!")
